About Us

aTyr’s mission is to translate novel biological pathways to develop innovative therapeutics with improved outcomes for patients.

Our focus is on the extracellular functionality and signalling pathways of tRNA synthetases. Built on more than a decade of foundational science in this area, we have built a global intellectual property estate directed to all 20 human tRNA synthetases, with over 300 protein compositions patented. 

Our lead clinical product candidate, ATYR1923, is a selective modulator of Neuropilin-2 (NRP2) that downregulates both the innate and adaptive immune responses in uncontrolled inflammatory disease states. We are developing ATYR1923 as a potential disease-modifying therapy for patients with severe inflammatory lung diseases with high unmet medical need. This includes interstitial lung diseases (ILDs), a group of rare immune-mediated disorders that cause progressive fibrosis of the lung, and severe respiratory complications caused by COVID-19. We selected pulmonary sarcoidosis as our first ILD indication and are currently enrolling a Phase 1b/2a proof-of-concept multi-center, clinical trial. The study has been designed to evaluate the safety, tolerability, steroid-sparing effect and immunogenicity of multiple doses of ATYR1923 and to evaluate established clinical endpoints and certain biomarkers to assess preliminary clinical activity of ATYR1923. The results of this study will guide future development of ATYR1923 in pulmonary sarcoidosis and provide insight for the potential of ATYR1923 in other ILDs such as chronic hypersensitivity pneumonitis (CHP) and connective tissue disease related ILD (CTD-ILD). In response to the COVID-19 pandemic, we recently initiated a Phase 2 study in patients with COVID-19 related severe respiratory complications. The study has been designed to evaluate the safety and preliminary efficacy of ATYR1923 as compared to placebo through the assessment of key clinical outcome measures such as fever and hypoxia as well as inflammatory biomarkers.

We are also advancing our pre-clinical pipeline of tRNA synthetases and NRP2 targeting candidates through internal research efforts, industry and academic collaborations. In March 2019, we entered into a research collaboration and option agreement with CSL Behring for the development of product candidates derived from up to four tRNA synthetases. We are also working closely with other collaborators and academia to further research in these areas.

Our Values

Patients First

We are guided by our focus on patients


We are data-driven and embrace the unfamiliar


We achieve quality results with a foundation of trust, honesty and consistency with our words, plans and actions

Courage and Humility

We are a passionate team that acts with determination and mutual respect


We are efficient with our time and resources, learning and adapting to an always changing environment